Performance of block spreading MIMO-CDMA systems for heavy multi-path environment

In CDMA systems using block spreading techniques, where a data-block modulates a spreading sequence to produce a transmitting symbol, a user inherent orthogonal carrier-frequency modulating system is proposed. This method contributes to accommodating as many users as the processing gain L and to red...

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Bibliographic Details
Main Authors: Tomita, M., Kuroyanagi, N., Ohtake, K., Ozawa, S., Suehiro, N.
Format: Conference Proceeding
Language:English
Subjects:
Aggregates
Detectors
Error analysis
Frequency
Interference
MIMO
Modulation coding
Multiaccess communication
Phase shift keying
Receiving antennas
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Summary:In CDMA systems using block spreading techniques, where a data-block modulates a spreading sequence to produce a transmitting symbol, a user inherent orthogonal carrier-frequency modulating system is proposed. This method contributes to accommodating as many users as the processing gain L and to reducing the guard sequence overhead. Applying a MIMO configuration without using coding and multiple constellation on PSK modulation to this system, especially using N pieces of receive antennas is considered. This block spreading system is capable of accommodating as many users per orthogonal carrier as N, by using a method of concatenating the N symbols received at N antennas. This means that the aggregate data rate per chip increases N in the maximum. Further it is shown that a fairly good error rate performance is achieved by selecting the practical aggregate data rate to be about 80% of the maximum rate.
DOI:10.1109/WIRLES.2005.1549394